I would paint above the chair rail a pail pink and below black with white polka dots or vertical stripes

White bedding and drapery with pink and black trim

So many things you can do- fabric, framed pictures, etc with a Parisian motif. Wall decals are quick and easy, and can be changed when she decides that she's outgrown that theme.

A soft pink (or mauve) with touches of black and grey. A chandelier and lots of layering for the bedding. Add youthful vintage French prints and a pillow. When she gets a older it's easy to switch the more youthful prints to fashion themed instead, which may suit a teenager. houzz= [houzz=];[houzz= [houzz=]